jquery - 无法从带注释的 Controller 获取自动格式化的 json 数据

Question

据我了解，如果您使用 mvc:annotation-driven 标签，那么您可以传回 JSON 格式的对象，前提是相关的 jackson jar 文件存在于类路径中。情况就是如此。

但是，我从服务器收到 406( Not Acceptable )响应。

这是带注释的 Controller 的相关部分:

@RequestMapping(value = "/{groupEventUID}/{attendeeId}/update2.htm", method = RequestMethod.POST)
public
@ResponseBody
DateResponse submitDate2(@PathVariable String groupEventUID, @PathVariable int attendeeId, ModelMap model) {
    return new DateResponse();
}

这是客户端页面上的 jquery 代码:

    <script type="text/JavaScript"> 
        $(document).ready(function(){
            $(".dayblock").click(function(){
                $(event.target).css('background-color','green');

                $.ajax({
                    url: "update2.htm",
                    type: "POST",
                    dataType: "json",
                    success: function(data){
                        alert("Data Loaded: " + data);
                    }
                }); 
            });
        });
    </script> 

我尝试放置在类路径中的 jackson jar 是:

jackson-core-asl-1.7.2.jar 和 jackson-mapper-asl-1.7.2.jar

我也尝试过

jackson-all-1.7.2.jar

仍然遇到可怕的 406..

DateResponse 对象是否需要显式注释才能将其转换为 JSON？我本以为使用现有的字段名称将是默认行为。

我认为最令人沮丧的是我看不到任何后端异常，所以我只能诉诸尝试和错误。

编辑:这是http header

Request URL:http://localhost:8080/7uid/5/update2.htm
Request Method:POST
Status Code:406 Not Acceptable

Request Headers

Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en-US;q=0.8,en;q=0.6
Connection:keep-alive
Content-Length:0
Cookie:JSESSIONID=C8B515F9BE0773BF7916E3FA7F17EE30
Host:localhost:8080
Origin:http://localhost:8080
Referer:http://localhost:8080/7uid/5/showAttendeeCalendar.htm
User-Agent:Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.84 Safari/534.13
accept:application/json, text/javascript, */*; q=0.01
x-requested-with:XMLHttpRequest

Response Headers

Cache-Control:no-cache
no-store
Content-Length:1070
Content-Type:text/html;charset=utf-8
Date:Mon, 07 Feb 2011 16:31:03 GMT
Expires:Thu, 01 Jan 1970 00:00:00 GMT
Pragma:no-cache
Server:Apache-Coyote/1.1

这是dispatcher-servlet.xml 文件:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd" >


    <context:component-scan base-package="com.crowdbot.nightout.web"/>
    <context:component-scan base-package="com.crowdbot.nightout.dao"/>


    <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />

    <!--
    Most controllers will use the ControllerClassNameHandlerMapping above, but
    for the index controller we are using ParameterizableViewController, so we must
    define an explicit mapping for it.
    -->
    <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <props>
                <prop key="index.htm">indexController</prop>
            </props>
        </property>
    </bean>


    <!--
    The index controller.
    -->
    <bean name="indexController"
          class="org.springframework.web.servlet.mvc.ParameterizableViewController"
          p:viewName="index" />


    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />


    <bean id="emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="loadTimeWeaver">
            <bean class="org.springframework.instrument.classloading.ReflectiveLoadTimeWeaver"/>
        </property>
    </bean>


    <bean id="myTxManager"
     class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="emf"/>
    </bean>

    <tx:annotation-driven transaction-manager="myTxManager" />


    <bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="jacksonMessageConverter"/>
            </list>
        </property>
    </bean>

    <mvc:annotation-driven/>

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:prefix="/WEB-INF/jsp/"
          p:suffix=".jsp" />


</beans>

编辑2:这是catalina.out

07-Feb-2011 17:05:46 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /opt/java/jdk1.6.0_21/jre/lib/amd64/server:/opt/java/jdk1.6.0_21/jre/lib/amd64:/opt/java/jdk1.6.0_21/jre/../lib/$
07-Feb-2011 17:05:46 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
07-Feb-2011 17:05:46 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 786 ms
07-Feb-2011 17:05:46 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
07-Feb-2011 17:05:46 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.29
07-Feb-2011 17:05:46 org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor host-manager.xml
07-Feb-2011 17:05:46 org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor ROOT.xml
07-Feb-2011 17:05:47 org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization started
07-Feb-2011 17:05:47 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing Root WebApplicationContext: startup date [Mon Feb 07 17:05:47 GMT 2011]; root of context hierarchy
07-Feb-2011 17:05:47 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
07-Feb-2011 17:05:47 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@3cc70b0d: defining beans []; root of factory hierarchy
07-Feb-2011 17:05:47 org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization completed in 329 ms
07-Feb-2011 17:05:47 org.springframework.web.servlet.FrameworkServlet initServletBean
INFO: FrameworkServlet 'dispatcher': initialization started
07-Feb-2011 17:05:47 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Mon Feb 07 17:05:47 GMT 2011]; parent: Root WebApplicationContext
07-Feb-2011 17:05:47 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from ServletContext resource [/WEB-INF/dispatcher-servlet.xml]
07-Feb-2011 17:05:48 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@228b677f: defining beans [mainController,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annot$
07-Feb-2011 17:05:48 org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean createNativeEntityManagerFactory
INFO: Building JPA container EntityManagerFactory for persistence unit 'NightOutPU'
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/main] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/main/*] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/index.htm] onto handler [org.springframework.web.servlet.mvc.ParameterizableViewController@4d3af084]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/addEditGroupEvent.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/groupEventSuccess.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/addEditAttendee.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/showAttendees.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/{attendeeId}/showAttendeeCalendar.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/{attendeeId}/update.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/{attendeeId}/update2.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/addEditGroupEvent.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/groupEventSuccess.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/addEditAttendee.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/showAttendees.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/{attendeeId}/showAttendeeCalendar.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/{attendeeId}/update.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/{groupEventUID}/{attendeeId}/update2.htm] onto handler [com.crowdbot.nightout.web.MainController@41a7c484]
07-Feb-2011 17:05:49 org.springframework.web.servlet.FrameworkServlet initServletBean
INFO: FrameworkServlet 'dispatcher': initialization completed in 1909 ms
07-Feb-2011 17:05:49 org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor manager.xml
07-Feb-2011 17:05:49 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory docs
07-Feb-2011 17:05:49 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory examples
07-Feb-2011 17:05:49 org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080

这是同一时期的本地主机日志:

07-Feb-2011 17:05:47 org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring root WebApplicationContext
07-Feb-2011 17:05:47 org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'dispatcher'
07-Feb-2011 17:05:49 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
07-Feb-2011 17:05:49 org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()

Answer 1

好的，已修复。

问题在于我已经注册了 DefaultAnnotationHadlerMapping 和 AnnotationMethodHandlerAdapter。我怀疑这些与标签设置的 bean 发生冲突。我认为这就是当您尝试将一堆不同的教程混合在一起时会发生的情况!

注释掉它们可以解决问题。

<!--<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> -->
<!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> -->

感谢大家的帮助!